1248631357 has 2 divisors, whose sum is σ = 1248631358. Its totient is φ = 1248631356.

The previous prime is 1248631339. The next prime is 1248631369. The reversal of 1248631357 is 7531368421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1147447876 + 101183481 = 33874^2 + 10059^2 .

It is an emirp because it is prime and its reverse (7531368421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1248631357 - 2¹¹ = 1248629309 is a prime.

It is a super-2 number, since 2×1248631357² = 3118160531367322898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1248635357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624315678 + 624315679.

It is an arithmetic number, because the mean of its divisors is an integer number (624315679).

Almost surely, 2^1248631357 is an apocalyptic number.

It is an amenable number.

1248631357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1248631357 is an equidigital number, since it uses as much as digits as its factorization.

1248631357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 1248631357 is about 35335.9782233349. The cubic root of 1248631357 is about 1076.8240478444.

Adding to 1248631357 its reverse (7531368421), we get a palindrome (8779999778).

The spelling of 1248631357 in words is "one billion, two hundred forty-eight million, six hundred thirty-one thousand, three hundred fifty-seven".